Ech0 before 5.0.1 Denial of Service via Accept-Language
Ech0 before 5.0.1 does not impose any size or shape limit on the Accept-Language header processed by its i18n middleware, which runs on every HTTP request. The header is passed unfiltered to go-i18n's NewLocalizer, which internally calls golang.org/x/text/language.ParseAcceptLanguage. The CVE-2022-32149 mitigation in x/text caps '-' characters but not '_' characters, which the parser aliases to '-', allowing quadratic-time parsing to be triggered with a large header (up to Go's default 1 MiB) built from underscore separators. An unauthenticated attacker can send such requests to consume roughly 1.5 seconds of CPU each, and concurrent requests can saturate a multi-core server (denial of service).
CVE-2026-79658
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-79658
Ech0
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "lin-snow",
"product": "Ech0",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "5.0.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.0.1",
"versionType": "semver"
}
],
"packageURL": "pkg:golang/github.com/lin-snow/ech0",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-79658
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #12893 · Revision 1
- Added to Heist Feed
- Publisher date